How low can I go???

[KC_Goose]

I'm getting ready to start work on my truck but not sure how low I can go.

I currently had a 1975 c10 stepside shortbed. I has 275/45/20's on it and Im wondering how low can I go without having to buy lower series tires. Im not sure the offset of the wheels but they do not stick out past the fender lips so I beleive they can tuck a little. I have the hd springs up front and the rear has 8 pack of leaf springs.

Also im leaning towards Mcgaughys kit but am open to any brand just want quality parts and want to know how low I can go with the current wheel/tire setup. I will try and post some pictures this weekend.

Thanks

[Jabes1]

I'm running 245 45 20 in the front and 275 45 20 in the rear. No inner fenders and a little trimming in the rear. No issues rubbing. I'm using 3" spring and 3" spindles, Blazer leafs with a flip. So my guess is its a 6/7 drop...